[Si]([O:8][C@H:9]1[C:13]2([CH2:15][CH2:14]2)[C:12](=[O:16])[N:11]([C:17]2[CH:24]=[CH:23][C:20]([C:21]#[N:22])=[C:19]([Cl:25])[CH:18]=2)[C@H:10]1[CH3:26])(C(C)(C)C)(C)C.C1COCC1.Cl.C(=O)([O-])O.[Na+]>CO>[Cl:25][C:19]1[CH:18]=[C:17]([N:11]2[C@@H:10]([CH3:26])[C@@H:9]([OH:8])[C:13]3([CH2:15][CH2:14]3)[C:12]2=[O:16])[CH:24]=[CH:23][C:20]=1[C:21]#[N:22]To a solution of 4-[(6S,7S)-7-(tert-butyldimethylsilyloxy)-6-methyl-4-oxo-5-azaspiro[2.4]hept-5-yl]-2-chlorobenzonitrile (89.0 mg) in a mixed solvent of THF (6 mL) and methanol (6 mL) was added 6 mol/L hydrochloric acid (4.0 mL), and the mixture was stirred at room temperature for 18 hr. The reaction mixture was added to saturated aqueous sodium hydrogen carbonate, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography, and recrystallized from hexane-ethyl acetate to give the title compound as a colorless solid (yield: 48.7 mg, 66%).
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